Mastercam: X72022 Virtual Usb Bus Error 39 Fix

Navigate to:

C:\Windows\System32\drivers\

Delete:

Before proceeding:

Note for Mastercam 2022 users: Version 2022 uses CodeMeter (Wibu) for licensing, not the Virtual USB Bus. If you see Error 39 with 2022, you are likely running an older HASP-dependent legacy installer or a mixed license environment. The fix below still applies.

Q: Does Error 39 mean my Mastercam license is pirated?
A: Not necessarily. It commonly occurs with legitimate legacy NetHASP licenses when upgrading from Windows 7 to 10/11.

Q: Will Mastercam X7 work on Windows 11?
A: With difficulty. You must use Test Mode + disable Secure Boot. For production, upgrade to Mastercam 2024+.

Q: Can I use a physical USB HASP instead of the virtual bus?
A: Yes. Plug the green HASP key directly into a USB 2.0 port (not USB 3.0). Uninstall the virtual bus driver completely. Mastercam will automatically detect the physical key.

Q: My antivirus keeps deleting vusbbus.sys – what do I do?
A: Add the entire Mastercam and CodeMeter folders to your AV exclusions list before reinstalling.

Conclusion

The Virtual USB Bus Error 39 in Mastercam X7 2022 can be frustrating, but it's often resolvable by updating USB drivers, disabling conflicting software, reinstalling the software, modifying system configuration, or running the software as an administrator. By following these troubleshooting steps, you should be able to resolve Error 39 and get back to working with Mastercam X7 2022. If issues persist, consider reaching out to Mastercam support or seeking guidance from a qualified technical support specialist.

To fix the Virtual USB Bus Error 39 in Mastercam (X7 through 2022 versions), you typically need to

address driver integrity issues caused by Windows security features or corrupted registry entries

The most common solution for modern Windows systems (10/11) is disabling Memory Integrity mastercam x72022 virtual usb bus error 39 fix

, which often blocks virtual USB drivers used for licensing. Matsusada Precision 1. Disable Core Isolation (Memory Integrity)

Windows security can block the virtual driver from loading, resulting in Error 39. Windows Security (search for it in the Start menu). Device security Core isolation details Memory integrity

your computer and check the Device Manager to see if the error is gone. 2. Remove "UpperFilters" and "LowerFilters" in Registry

If disabling security doesn't work, corrupted registry values may be preventing the driver from loading. , and press Enter. Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\ Find the folder: 36FC9E60-C465-11CF-8056-444553540000 In the right pane, look for UpperFilters LowerFilters . Right-click and your computer. 3. Reinstall HASP Drivers

Corrupted drivers are a frequent cause. A clean reinstall is often necessary. How to Fix USB Error Code 39 In Windows 10/8/7 [Tutorial]

The Virtual USB Bus Error 39 in Mastercam (versions X7 through 2022) is primarily caused by a Windows security feature called Core Isolation (Memory Integrity), which prevents older or unauthorized drivers from loading. Fix: Disabling Core Isolation

This is the most common and effective solution for this specific error: Open the Start menu and search for Windows Security. Navigate to Device security in the left-hand sidebar. Click on Core isolation details. Toggle the Memory integrity switch to Off. Restart your computer to apply the changes. Additional Troubleshooting Steps

If disabling Core Isolation does not resolve the issue, try these alternatives:

Registry Edit (Hypervisor Enforced Code Integrity): Open regedit and navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios\HypervisorEnforcedCodeIntegrity. Set the Enabled value to 0 and restart.

Reinstall USB Controllers: In Device Manager, expand "Universal Serial Bus controllers," right-click each controller (except root hubs), select Uninstall device, and restart your PC to allow Windows to reinstall them automatically.

Delete Corrupt Filters: In the Registry Editor, check for and delete any UpperFilters or LowerFilters values in the relevant device class keys to clear corrupted driver instructions.

Fix User Profile: Some users have reported that deleting and recreating a corrupt Windows User profile fixed persistent launch errors after multiple Mastercam crashes. Interesting Feature: Unified "Mastercam Learning" Navigate to: C:\Windows\System32\drivers\

A standout shift between the older X7 version and modern versions like 2022 is the deep integration of Mastercam Learning Edition and the Mastercam University portal. While X7 was often siloed, 2022 provides users with a more streamlined way to access tutorial files and official training directly within the ecosystem, reflecting the industry's shift toward continuous software-integrated education. AI responses may include mistakes. Learn more Mastercam X7-2022 Virtual Usb Bus Error 39 - Google Groups

The Virtual USB Bus Error 39 in Mastercam versions X7 through 2022 typically indicates that Windows cannot load the device driver for the virtual HASP or dongle emulator, often due to a driver being corrupted, missing, or blocked by modern security features. The primary resolution involves disabling Core Isolation (Memory Integrity) in Windows Security or removing specific Registry filters that interfere with driver loading. Primary Cause: Windows Core Isolation

Modern versions of Windows 10 and 11 include a security feature called Memory Integrity (part of Core Isolation). This feature prevents unauthorized code from running in high-security processes but frequently blocks older virtual drivers used by Mastercam emulators. Experts from Matsusada Precision and RT Systems identify this as the leading cause of Code 39 errors for USB-related hardware. How to Fix: Open Windows Security and navigate to Device Security. Click on Core isolation details. Toggle Memory integrity to Off. Restart your computer to apply changes. Secondary Cause: Corrupted Registry Filters

If disabling Core Isolation does not work, the error may stem from corrupted "UpperFilters" or "LowerFilters" in the Windows Registry. These entries can prevent Windows from correctly identifying and loading the virtual USB bus required for Mastercam. Registry Modification: Open regedit (Registry Editor).

Navigate to the relevant device class key. While common for optical drives, similar issues affect virtual USB controllers. According to Microsoft Support, deleting these filters can force Windows to rebuild the driver stack.

Search for UpperFilters and LowerFilters within the USB or Virtual Bus keys and delete them. Restart the machine. Driver Reinstallation and Virtual Key Issues

For virtual keys like MultiKey used in older Mastercam setups, a clean reinstallation of the virtual bus is often necessary. Users on Google Groups have noted that standard Aladin or HASP drivers may fail if bizarre interactions occur with other USB peripherals (like 3D Connexion mice). Resolution Steps:

Uninstall the Virtual Device: In Device Manager, find the device with the yellow exclamation mark (Error 39), right-click, and select Uninstall device.

Scan for Changes: Use the Action > Scan for hardware changes option in Device Manager to let Windows attempt a clean reload.

Update HASP Drivers: Ensure you are using the latest HASP HL driver compatible with your specific Windows version.

The following tutorials provide visual step-by-step guidance on disabling security features and editing the registry to clear Error 39:

Once fixed, you can avoid recurrence with these best practices: Delete: Before proceeding:

| Cause | Description | |-------|-------------| | Disabled test signing / BCD policy | The Virtual USB Bus driver is a kernel-mode, test-signed driver (even in official releases). Windows 10/11 with Secure Boot and no test signing enabled will reject it, throwing Code 39. | | Remnants of old HASP drivers (Aladdin/Sentinel) | Older HASP drivers leave registry keys and filter drivers that clash with the newer Virtual USB Bus. | | USB device instance collision | Windows retains stale device instances for the same hardware ID, causing resource conflicts. | | Corrupt driver store | Rare but possible after failed Windows updates. | | Antivirus/USB control software | Sophos, McAfee Device Control, or USB lockdown tools block driver activation. |

Even after uninstalling, old driver files may linger.

C:\Windows\SysWOW64\drivers\

For nearly a decade, users of Mastercam—from X7 to the 2022 release—have encountered a baffling licensing error:

"Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39)"

This appears in Device Manager under System devices as a broken entry named Virtual USB Bus. The error prevents the HASP (Hardware Against Software Piracy) or NetHASP license dongle from being recognized, rendering Mastercam unusable.

Despite appearing driver-related, Error 39 is rarely a true driver corruption issue. Instead, it stems from Windows driver signing enforcement, conflicting kernel drivers, or registry permission inheritance breaks—often triggered by Windows 10/11 feature updates, security patches, or third-party USB filtering software.

This feature provides a systematic, field-tested guide to diagnosing and eliminating Error 39 across Mastercam versions X7 through 2022, on Windows 10 and 11 (64-bit only).